fix: compiler warnings and errors

Author: FrancoisCarouge

source/matplot/core/axes_object.h

@@ -29,6 +29,8 @@ namespace matplot {
 
         explicit axes_object(axes_handle parent);
 
+        virtual ~axes_object() = default;
+
       public:
         virtual double xmax();
         virtual double xmin();

source/matplot/util/common.cpp

@@ -866,8 +866,8 @@ namespace matplot {
 
         // Initial calculations
         if (log) {
-            std::invalid_argument("Not implemented yet. The library does not "
-                                  "need that as it is.");
+            throw std::invalid_argument("Not implemented yet. The library does "
+                                        "not need that as it is.");
         }
 
         // Data range

source/matplot/util/common.h

@@ -605,9 +605,10 @@ namespace matplot {
         /// \brief Helper method for determining the whole array size.
         /// Required for caching inner vector's size.
         std::size_t calculate_size(const vector_2d &vec) {
-            return std::accumulate(
-                vec.begin(), vec.end(), (std::size_t)(0),
-                [](auto cnt, const auto &vec) { return cnt + vec.size(); });
+            return std::accumulate(vec.begin(), vec.end(), (std::size_t)(0),
+                                   [](auto cnt, const auto &inner_vec) {
+                                       return cnt + inner_vec.size();
+                                   });
         }
 
       public: